The BEST File Manager for Windows

Works with and greatly enhances:

Windows 11, 10

Windows 8, 7, Vista, XP

Servers 2003 and later

Starting at just $50 for home use and $69 for a business license (and a business two-pack for just $99!)

What's New / What's Up

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Version 4: the future

Major new tools, significant upgrades to current components and faster folder listings.

  • Find and rename problem files: bad paths, illegal characters, Linux & iOS (Mac) characters.
  • Check files and folders for compliance with different file systems e.g., NTFS, Fat-16, Fat-32, eFat, CDs, iOS, Linux and custom.
    Know if the files are right before you copy.
  • Delete files no matter their length or how they are named.
  • Powerful renaming with RegEx e.g. change 'Romeo Smith' into 'Smith, Romeo' and much more.
  • Lightening fast directory listing no matter how large the folder.
  • Detailed reports for copy errors.
  • Variable text size for views and dialogs.
  • and many more improvements and fixes..


See the V4 preview here.

Update May 2017

A May 2017 Microsft security update for Windows 10 conflicted with a major routine in FileBoss resulting in FileBoss not starting on some Windows 10 systems.

Versions V3.101 and later, fix the problem. You can read more about this at the page
Windows Creators Conflict.


Fix Illegal Filenames

Illegal Characters

Types of Illegal Characters

The file is in use

Problably the most common reason a file can't be renamed, moved or deleted is that it is in use by another program. Many programs, but certainly not all, will put a lock on a file when it opens it

The file name is too long

For all versions of Windows released in the past fifteen years no file name or folder can be longer than 

A folder name is too long

The same limitation to the length of the actual file name of 256 characters also applies to the length of any folder along its path.

The length of the path plus the file name is too long


The file name or path contains illegal characters


The file name was created by another system


The file has no name


The file is protected by Windows (hidden,system, more...)


The file is read only